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Engineering
Reynolds Number
Re = v·L/ν — flow regime (laminar / turbulent)
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Parameters
Results
- Re
- 100,000
- Regime
- Turbulent
- Crit. Re (pipe)
- ~2300 lam / ~4000 turb
Water ν ≈ 1×10⁻⁶ m²/s at 20°C. L — pipe diameter or airfoil chord.
How it works
Calculate Reynolds number to classify laminar vs. turbulent fluid flow.
Who it's for: Mechanical and chemical engineers analyzing pipe and channel flow.
Re = v·L/ν where L is characteristic length (e.g., pipe diameter) and ν is kinematic viscosity.
Re < 2300 → laminar; Re > 4000 → turbulent; between is transitional.
Water ν ≈ 1×10⁻⁶ m²/s at 20°C.
How to use
- Enter Velocity (m/s), Char. length (m), and ν (×10⁻⁶ m²/s).
- Read Re and Regime classification.